Kao Corporation

Hiromi Nambu

Takayuki Amiya

Hiroshi Mizuhata

Satoshi Sugawara

Yuki Wakabayashi

Akito Itoi

Manabu Suzuki

Yoshihiro Hasebe

Akihiro Kondo

Kazuo Kuwahara

Yukihiro Fukuyama

Takahide Minami

Yutaka Murai

Tadashi Igarashi

Yasushi Sasaki

Yukio Inomata

Tetsuji Kito

Akira Umada

Tetsuji Kitoh

Kazuhiro Ishikawa

Yoshihiko Watanabe

Makoto Tsuji

Takashi Higashi

Makoto Inoue

The present invention provides a nonaqueous pigment dispersant containing a copolymer having: (a) a constituent unit derived from a nitrogen atom-containing polymerizable macromonomer having an ethylenic unsaturated double bond at one terminal, and (b) a constituent unit derived from a monomer unit having an ethylenic unsaturated double bond, being copolymerizable with the nitrogen atom-containing polymerizable macromonomer of constituent (a), and a pigment dispersion composition containing the dispersant, a pigment and a nonaqueous solvent.

Pigment dispersant containing a copolymer with constituent units derived from polymerizable macromonomers

The present invention relates to a toner for electrophotography which exhibits an excellent heat-resistant storage property and a wide fusing temperature range, and a process for producing the toner for electrophotography. There are provided a process for producing a toner for electrophotography which includes (A) a step of emulsifying a resin binder containing a polyester having a constitutional unit derived from a trivalent or higher-valent carboxylic acid in an aqueous medium; (B) a step of aggregating emulsified particles contained in an emulsion obtained in the step (A); and (C) a step of coalescing aggregated particles obtained in the step (B), said process further including the following steps which are to be conducted after the step (A): (a) a step of adding a compound having at least one functional group selected from the group consisting of an oxazoline group and a glycidyl group; and (b) a step of forming a chemical bond between the compound having the at least one functional group and the resin binder containing the polyester, as well as a toner for electrophotography obtained by the process.

Process for producing toner for electrophotography

This invention provides water-absorbing polymer particles suitable particularly for cosmetics, wherein silicone can be stably present on the surface of a water-absorbing polymer even in various formulations thereby giving dry feeling in use even after water absorption. The silicone-modified water-absorbing polymer particles of this invention comprises water-absorbing polymer particles coated thereon via chemical bonding, with a silicone compound having at least one functional group.

Silicone-modified water-absorbing polymer particles and method for producing the same

The invention relates to crosslinked (meth)acrylate-based resin particles having an average particle diameter of 1 to 10 &#x3bc;m, containing monomer components containing a monomer having a carboxyl group and at least one monomer selected from an acrylate and a methacrylate copolymerized therein, the particles having a surface coated with a surfactant having a sulfonic acid group or a sulfonate group, and a process for producing the same.

Resin particles comprising a (meth)acrylate copolymer and a surfactant having a sulfonic-acid or sulfonate group

The invention provides a polymer composite particle having superb blending stability even in a W/O emulsion cosmetic, a highly effective ultraviolet protection effect and a good feeling in use. The invention also relates to a method of producing the polymer composite particle and a cosmetic composition containing the polymer composite particle. A preferred polymer composite particle contains a metal oxide coated with a silicone and/or fluorine compound and has an average particle diameter of 1 &#x3bc;m or less, wherein the polymer composite particle is obtained by polymerizing a crosslinking agent with a vinyl monomer contained in an amount of 25% by weight based on 100% by weight of the sum of total of all the monomers and crosslinking agent and wherein the vinyl monomer has a solubility parameter calculated by the Fedors method of less than about 8.9. A preferred cosmetic composition may contain (A) a microparticle metal oxide having an average primary particle diameter of from 0.001 to 0.1 &#x3bc;m, and (B) a flake zinc oxide having an average primary particle size of from 0.1 &#x3bc;m to 1 &#x3bc;m and an average thickness of from 0.01 &#x3bc;m to 0.2 &#x3bc;m, which provides ultraviolet protection ability and visible-light transmittance.

Polymer composite particle comprising metal oxide and silicone and/or fluorine and method of producing the same

Process for producing improved super absorbent polymer

The process of the present invention for producing polymer particles with an irregular shape by polymerizing a water-soluble polymerizable monomer in a system comprising a hydrophobic organic solvent inert to the polymerization and an aqueous solution of the water-soluble polymerizable monomer is characterized in that the system a glycoside compound having such a structure that the hydrogen atom of the hemiacetal bond in the compound has been substituted for a hydrophobic group, or a gluconamide compound as a dispersant.

Process for producing polymer particles with irregular shape by

Growing community of inventors

Wakayama, Japan

Hiromi Nambu